"The Doctor -- the last of the Time Lords -- travels through space and time, using ingenuity to foil the forces of destruction and domination. Normally he travels with a companion, who helps keep him grounded. The Doctor is over 900 years old and is able to survive death by regenerating into a new body; his ship, the TARDIS, is bigger on the inside than the outside and, though it should be able to change its outward appearance, is stuck in the form of a blue police telephone box from the mid-20th century."